CVE-2026-65957

Severity not reported

Data quality: partial. Some fields were not provided by the source.

Helio is an MCP proxy that sits between AI agents and the tools they use.

Helio is an MCP proxy that sits between AI agents and the tools they use. Prior to version 0.8.0, the dashboard sideband (default 127.0.0.1:3100) validated CORS request origins by matching the hostname against a private-network string prefix (10., 172.16.–172.31., 192.168.) rather than validating an IP address. A public DNS name such as 192.168.attacker.com, 10.evil.io, or 172.16.pwn.example also satisfies that prefix, so the proxy echoed the attacker origin in Access-Control-Allow-Origin. This issue has been patched in version 0.8.0.

CVSS

—

Awaiting analysis by NVD

Timeline (UTC)

Published: 2026-11-11 21:16

Modified: 2026-11-11 21:16

NVD status: Received

Last synced 5 hours ago

Verified against the source API 2026-11-11 21:41 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

Not reported by the source (unknown — not "none").

Weakness classification (CWE)

CWE-346 CWE-942

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

No vendor advisory or patch reference tagged by NVD. Check the references below.

References

https://github.com/gethelio/helio/commit/4ca8329c38b0edbc5e4d782a4e3b0cfc5cd7782e security-advisories@github.com
https://github.com/gethelio/helio/pull/121 security-advisories@github.com
https://github.com/gethelio/helio/releases/tag/v0.8.0 security-advisories@github.com
https://github.com/gethelio/helio/security/advisories/GHSA-2c3r-q7gv-hp2m security-advisories@github.com

Data sources

NVD CVE API 2.0 — fetched 2026-11-11 21:41 UTC · record ↗

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